Drum Fisheye Image:If you attach DSLR
with Focal length multiplier>1 to Sigma 8mm f4 EX fisheye lens, the two
margins in the final fisheye images will be cut. We call it drum fisheye image
derived from its shape.

Secondly, please shoot 4 fisheye image in portrait mode as each image covers 120x180 degrees. Since Panoweaver also accepts 4+top/bottom, you can also shoot up/ down to get the top/bottom fisheye images.

Secondly, please shoot 6 fisheye image in portrait mode OR 4 fisheye image in landscape mode. Since Panoweaver also accepts 4+top/bottom, you can also shoot up/ down to get the top/bottom fisheye images.